I'm convinced that the rating system needs to be improved after seeing someone getting 1k points from a 3v3 victory against 2 big noobs and one half decent player.
There are players who solo 8 other players and get the usual reward after everyone else quit, so this system clearly is either not implemented correctly or the average microsoft developer (or copycat dude) messed it up.
I'm not going to expect anything, as there weren't any relevant changes in the past regarding to this matter, but someone should really try to revise that rubbish and use more inputs plus complex graphs or at least adapt to the latest standard. The game count might be a inversive exponential factor, but this is too much.
Sidenote: There are more recent versions of TrueSkill (2.0 as of 2018) and RNN algos.